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[ubuntu] /proc/cpuinfo not showing all 16 cores in 11.10

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http://ubuntuforums.org – For some reason /proc/cpuinfo is only displaying one core from a 16 core processor. However hwinfo --cpu shows the 16 cores. I have ACPI enable in the bios and I have cleared the noacpi tags out of the grub.cfg file. Anyone have any ideas out to get this corrected? System Specs: SuperMicro AS-1012G-MTF Server AMD 6274 64GB Memory /proc/cpuinfo Quote: processor : 0 vendor_id : AuthenticAMD cpu family : 21 model : 1 model name : AMD Opteron(TM) Processor 6274 stepping : 2 cpu MHz : 2200.000 cache size : 2048 KB physical id : 0 (Hardware)

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Submitted by colm on 02/17/2012 – Made popular on 02/17/2012

Stories similar to [ubuntu] /proc/cpuinfo not showing all 16 cores in 11.10

No of CPU's and No of Core 16 weeks 5 days ago

I would like to understand how many number of CPUs and cores do I have on my server based on following out put..

Quote:

[root@xyz ~]# cat /proc/cpuinfo processor : 0 vendor_id : GenuineIntel cpu family : 6 model : 26 model name : Intel(R) Xeon(R) CPU X5570 @ 2.93GHz stepping : 5 cpu MHz : 1596.000 cache size : 8192 KB physical id : 0 siblings : 8 core id : 0 cpu core

cat /proc/cpuinfo processor : 0 vendor_id : AuthenticAMD cpu family : 15 model : 107 model name : AMD Athlon(tm) 64 X2 Dual Core Processor 5200+ stepping : 2 cpu MHz : 2700.000 cache size : 512 KB physical id : 0 siblings : 2 core id : 0 cp...

2x Xeon E5620 . 16 Cores altogether. /proc/cpuinfo shows cache is only @ 4096kb

According to intel this should have 12MB of "smart cache". Doing searched for E5620 and CPUinfo shows the correct number:

cache size : 12288 KB

However mine shows this:

processor : 15 v endor_id : GenuineIntel cpu family : 6 model : 44 model name : Intel(R) Xeon(R) CPU

2x Xeon E5620 . 16 Cores altogether. /proc/cpuinfo shows cache is only @ 4096kb

According to intel this should have 12MB of "smart cache". Doing searched for E5620 and CPUinfo shows the correct number:

cache size : 12288 KB

However mine shows this:

processor : 15 v endor_id : GenuineIntel cpu family : 6 model : 44 model name : Intel(R) Xeon(R) CPU

Hi, im using an Intel Core 2 Quad (Q8400 @ 2.66ghz) and when i use cat /proc/cpuinfo all informatino is correct except my clock speeds, heres my output:

processor : 0 vendor_id : GenuineIntel cpu family : 6 model : 23 model name : Intel(R) Core(TM)2 Quad CPU Q8400 @ 2.66GHz stepping : 10 cpu MHz : 2003.000 cache size : 2048 KB physical id : 0 siblings : 4 core id : 0 cpu cores : 4 apicid

Wrong Processor Info 35 weeks 2 days ago

I'm using Intel i5-2430M processor which is a dual core processor, but the output of /proc/cpuinfo shows four cores. Why? Is is because of hyper-threading?

If yes, is there any way I can see the actual number of cores?

Also, how can I see the sizes of L1 and L2 caches?

Output of /proc/cpuinfo: http://pastebin.ubuntu.com/1206427/

Kernel Version 3.3.4-5.fc17.x86_64

CPU info:

sashan@dhcp-au-122 ~ $ cat /proc/cpuinfo processor : 0 vendor_id : GenuineIntel cpu family : 6 model : 42 model name : Intel(R) Core(TM) i7-2640M CPU @ 2.80GHz stepping : 7 microcode : 0x28 cpu MHz : 2793.577 cache size : 4096 KB physical id : 0 siblings : 1 core id : 0 cpu cores : 1 apicid : 0 initial apicid :

[drm:intel_lvds_enable] Error 33 weeks 23 hours ago

I am getting the following error message at boot:[ 2.859011] [drm:intel_lvds_enable] *ERROR* timed out waiting for panel to power onThe laptop is an HP DM4-3055DX.

I have done a sched_setaffinity test in Linux in a server with 1 socket ,4 cores , the following /proc/cpuinfo showes the cpu information :

processor : 0 model name : Intel(R) Core(TM)2 Quad CPU Q8400 @ 2.66GHz cache size : 2048 KB physical id : 0 siblings : 4 cpu cores : 4

processor : 1 model name : Intel(R) Core(TM)2 Quad CPU Q8400 @ 2.66GH